emperor -
Medieval political theory Specifically, the ruler of the Holy Roman Empire; the world-monarch.
emperor -
A large, relatively valuable marble in children's games.
Wikipedia
An emperor is a (male) monarch, usually the sovereign ruler of an empire or another type of imperial realm. Empress, the female equivalent, may indicate an emperor's wife or a woman who rules in her own right. Emperors are generally recognized to be of a higher honor and rank than kings.